The situation when the refrigerator does not turn off and buzzes around the clock is familiar to many owners of household appliances. During normal operation, the compressor should be turned off periodically, giving the system a rest and maintaining the set temperature. If the motor runs without interruption, this not only leads to a significant waste of electricity, but also creates the risk of a rapid failure of the expensive unit.
The constant operation of the compressor can be caused by both trivial violations of operating rules and serious technical breakdowns of components. Modern models s Inverter motors can run longer than conventional motors, but they also have stop cycles. It is important not to panic, but to consistently analyze the situation in order to understand whether the problem lies in small things or whether a call to the technician is required.
In this article we will analyze in detail the main reasons for the continuous operation of refrigeration equipment. You will learn how to carry out initial diagnostics on your own, which components most often fail and when independent repair is no longer possible without a special tool.
Violation of temperature conditions and tightness
The most common reason for this The refrigerator does not turn offis a banal inability to reach the set temperature. If heat is constantly entering the chamber from the outside, the sensors record the deviation and give the command to the compressor to work without stopping. First of all, check the tightness of the door.
The rubber seal dries out over time, cracks or deforms. Warm air enters the chamber through the resulting cracks, which immediately cools, causing condensation and causing the motor to wear out. It may also be due to the door being misaligned or foreign objects (such as crumbs or pieces of packaging) getting into the sealing area.
- 🚪 Check that the door closes tightly around the entire perimeter using a test with a sheet of paper.
- 🌡️ Make sure that you have not set the “Super Freeze” or “Maximum Cold” mode, which is forced disables the stop cycle.
- 🥘 Do not place hot or warm products in the chamber that sharply increase the internal temperature.
If everything is in order with the seal and settings, pay attention to the location of the equipment. Refrigerator should stand at a distance of at least 5-10 cm from the back wall to the wall or furniture. Violation of the ventilation gap leads to overheating of the condenser, which also forces the system to work in enhanced mode.
⚠️ Attention: If you notice that the rubber seal has lost its elasticity and does not fit tightly, try wiping it with warm water and soap. In some cases, this will temporarily restore its properties, but replacement is the most reliable solution.
Malfunctions of the thermostat and temperature sensors
The thermostat (thermostat) is the “brain” that controls turning the compressor on and off. It is he who reads the temperature inside the chamber and opens the electrical circuit when the goal is achieved. If this element fails, the circuit does not open, and the refrigerator operates constantly..
In mechanical models, the thermostat is a device with a capillary tube filled with freon. When the gas expands or contracts, the tube acts on the contacts. Over time, the contacts may “stick” in the “on” position, or the tube itself will lose its seal. In electronic models, they are responsible for this temperature sensors, which can give erroneous readings to the controller.
Signs of a malfunctioning thermostat are often accompanied by other symptoms:
- ❄️ The chamber is too cold, food freezes, although this has not happened before observed.
- 💡 The light inside the refrigerator may not go out if it is tied to an operating cycle (in some models).
- 🔌 The compressor does not respond to turning the temperature control knob to the “minimum” position.
Diagnostics of a mechanical thermostat is possible at home. To do this, you need to disconnect the wires from the thermostat terminals and short them directly. If after this the refrigerator starts working, it means that the problem is in the regulator, and it needs to be replaced with a new one.
How to check the thermostat with a multimeter?
To check a mechanical thermostat with a multimeter, switch the device to the dialing mode. Attach the probes to the contacts of the regulator. At room temperature there should be a circuit (beep). Place the thermostat sensing tube in the freezer for 10-15 minutes. After cooling, the circuit should break (the signal disappears). If the chain does not break in the cold, the thermostat is faulty.
Refrigerant problems: freon leak
One of the most serious reasons why the refrigerator does not turn offis a refrigerant (freon) leak. Freon circulates through the system, taking heat from the chambers and releasing it into the environment through the radiator. If the amount of gas in the circuit decreases due to microcracks or corrosion, the cooling efficiency decreases.
The compressor tries to compensate for the lack of cold by operating in continuous mode. However, even with constant operation, it cannot reach the set temperature, since there is not enough “working fluid” for heat exchange. This leads to the motor overheating, and the food in the chamber begins to deteriorate.
The main signs of a freon leak:
- 📉 The temperature in the main chamber and freezer is higher than normal, the food is thawed.
- 🔥 The side walls of the refrigerator (where it is hidden) condenser) remain cold or warm only partially.
- 🔊 The compressor operates with a characteristic gurgling or hissing.
A freon leak is not just a breakdown that can be ignored. Operating the compressor under low pressure conditions can lead to its complete combustion, which will make repairs economically unfeasible. It is impossible to eliminate the leak and refill the system on your own: evacuation of the circuit and special equipment are required.
Clogged capillary tube and compressor malfunction
Circulation of freon in the system is possible only if it passes freely through the capillary tube. This is a very thin element that is easily clogged with oil oxidation products, moisture or debris that gets into the system during poor-quality repairs. The blockage creates a “plug” that disrupts the pressure.
As a result, the compressor tries to push gas, working with increased load, but cooling does not occur. Often, when there is a blockage, you can hear it the refrigerator is humming louder than usual, and then the protection relay clicks, and the motor stalls, only to start again after a while.
Also, the cause of continuous operation may be wear and tear on the compressor itself. Over time, the valves inside the motor lose their tightness or break. The compressor loses the ability to create the necessary pressure, and even working around the clock, it cannot “catch up” with cold.
Diagnostics of these components requires a professional approach:
| Symptom | Probable cause | Actions |
|---|---|---|
| The compressor is hot, runs non-stop, there is no cold | Freon leak or blockage | Call a technician to find a leak/purge |
| Loud knocking, clicking, starting for 10-20 seconds and shutting down | Malfunction of the start relay or compressor wedge | Replacement of the relay or repair/replacement of the motor |
| The refrigerator works, but does not turn off, in the chamber +10°C | Loss of compressor performance | Measuring pressure, replacing the compressor |
⚠️ Attention: Do not try to open the sealed circuit yourself or change the compressor without soldering skills and the availability of refrigerant. Incorrect assembly of the system will lead to instant failure of the new motor.
The influence of the No Frost system and electronics
In refrigerators with the system No Frost another critical element is added - an evaporator hidden behind a plastic panel. If the defrost system (heating element, defrost timer or defrost sensor) fails, the evaporator becomes coated with ice. Ice blocks air circulation, and cold stops flowing into the chamber.
Temperature sensors record heat and force the compressor to work without interruption. However, the cold is not distributed because the fan cannot blow air through the ice jam. In such cases, the refrigerator may hum for days, but it will be warm inside.
Also, in modern models, an electronic control module is responsible for all processes. Malfunctions in its operation, oxidation of contacts or voltage surges can lead to incorrect processing of signals from sensors. The module may “think” that it is hot in the chamber and not give a command to stop the motor.
☑️ Primary diagnosis No Frost
When you need to call a specialist
Repair of refrigeration equipment is divided into two types: what you can do yourself (replacement seal, defrosting, checking settings), and what requires professional intervention. If simple methods do not help the refrigerator does not turn off, further self-diagnosis can be dangerous.
A call to a specialist is necessary if:
1. A freon leak has been detected (soldering and refilling required).
2. The compressor is faulty (the motor needs to be replaced and the system overhauled).
3. The electronic control module has failed (re-flashing or board replacement is required).
4. The capillary system is clogged (purging with nitrogen under pressure is required).
The technician has the necessary tools: leak detectors, gauge manifolds, vacuum pumps. Only with their help can you accurately determine the cause of the breakdown and eliminate it, guaranteeing a long service life of the unit after repair.
⚠️ Attention: Prices for repairs and availability of spare parts may vary depending on the manufacturer and region. Before starting work, always check the final cost with a specialist, as it may differ from the initial diagnosis.
Frequently asked questions (FAQ)
Can the refrigerator not turn off due to the heat in the room?
Yes, If the room temperature exceeds +30°C, the heat transfer of the condenser deteriorates. The compressor will run longer to compensate for the heat gain. In extreme heat, it may not turn off at all until the temperature in the room drops.
How long should a refrigerator operate normally?
In normal mode, the operating time ratio is about 30-40%. This means that out of 60 minutes the compressor works for approximately 20-25 minutes, and rests for the rest of the time. When loading with warm products, the operating time increases.
Is it dangerous if the refrigerator has been working without stopping for several days?
Yes, it is dangerous. The life of the compressor is limited, and continuous operation leads to overheating and wear of rubbing parts. In addition, this creates a fire hazard and the risk of food defrosting.
Why does the new refrigerator not turn off for a long time after the first turn on?
When first started, the system needs time to cool the entire volume of the chambers and enter operating mode. During this time, the compressor can operate continuously for up to 12-24 hours. It is normal if, after reaching a temperature, it begins to turn off cyclically.